Datasheet > AD8410A

AD8410A

更新时间： 2023-12-20 18:44:51

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
25页	1612K
描述
?2 V to 70 V Wide Input Voltage Range, 2.2 MHz High Bandwidth, Current-Sense Amplifier with PWM Rejection

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AD8410A 数据手册

Data Sheet

AD8410A

APPLICATIONS INFORMATION

inductive load causes the common-mode voltage to be held one

diode drop below ground by the clamp diode.

SOLENOID CONTROL

High-Side Current Sense with a Low-Side

Switch

In the case of a high-side current sense with a low-side switch,

the PWM control switch is ground referenced. Connect an inductive

load (solenoid) to a power supply and place a resistive shunt

between the switch and the load (see Figure 60). An advantage

of placing the shunt on the high side is that the entire current,

including the recirculation current, is measurable because the shunt

remains in the loop when the switch is off. In addition, diagnostics

are enhanced because shorts to ground are detected with the shunt

on the high side.

In this circuit configuration, when the switch is closed, the common-

mode voltage decreases to near the negative rail. When the switch

is open, the voltage reversal across the inductive load causes the

common-mode voltage to be held one diode drop above the battery

by the clamp diode.

Figure 61. High-Side Switch

High Rail Current Sensing

In the high rail current sensing configuration, the shunt resistor is

referenced to the battery. High voltage is present at the inputs of

the current-sense amplifier. When the shunt is battery referenced,

the AD8410A produces a linear ground-referenced analog output.

Additionally, the AD8214 provides an overcurrent detection signal

in <100 ns (see Figure 62). This feature is useful in high current

systems where fast shutdown in overcurrent conditions is essential.

Figure 60. Low-Side Switch

High-Side Current Sense with a High-Side

Switch

The high-side current sense with a high-side switch configuration

minimizes the possibility of unexpected solenoid activation and

excessive corrosion due to constant battery draw (see Figure 61).

In this case, both the switch and the shunt are on the high side.

When the switch is off, the battery is removed from the load, which

prevents damage from potential shorts to ground while still allowing

the recirculating current to be measured and to provide diagnostics.

Removing the power supply from the load for the majority of the

time that the switch is open minimizes the corrosive effects that can

be caused by the differential voltage between the load and ground.

Figure 62. High Rail Current Sensing

INPUT FILTER

In typical applications, such as motor control and solenoid current

sensing, filtering at the input of the AD8410A can be beneficial in

reducing differential noise, as well as transients and current ripples

flowing through the input shunt resistor. Also, it is recommended to

filter at the input of the AD8410A to further reduce the electromag-

netic interference (EMI). The EMI specifications vary depending on

the application. Filter at the input if the output cannot be filtered

because filtering at the output changes the low output impedance

When using a high-side switch, the battery voltage is connected

to the load when the switch is closed, causing the common-mode

voltage to increase to the same value as the battery voltage. In

this case, when the switch is open, the voltage reversal across the

analog.com

Rev. A | 21 of 25

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与AD8410A相关器件

型号	品牌	获取价格	描述	数据表
AD8411A	ADI	获取价格	?2 V至70 V宽输入电压范围、2.7 MHz高带宽、具有PWM抑制和50 V/V增益的
AD8417	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier
AD8417_17	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier
AD8417-2	ADI	获取价格	双向零点漂移电流检测放大器
AD8417BRMZ	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier
AD8417BRMZ-RL	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier
AD8417R-EVALZ	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier
AD8417RM-EVALZ	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier
AD8417WBRMZ	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier
AD8417WBRMZ-RL	ADI	获取价格	Bidirectional, Zero Drift, Current Sense Amplifier

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